Officials with the police and fire department and the Office of the Ontario Fire Marshal are on the scene of the fire on Park Street North.
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The fire was called in just after 2 this morning.
Firefighters arrived the four-plex south of Wolfe Street to find smoke and flame showing from a first floor window.
The fire was brought under control but the unit was heavily damaged. There is no estimate of damage, and investigation into the cause continues.
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